Double-tap with two fingers: Show context menu

Double-tap with three fingers: Read text attributes

Double-tap with four fingers:  Open search mode

Tap three times with four fingers: Show all Narrator commands

Swipe left, right, up, or down with two fingers: Scroll

Swipe left or right with three fingers:  Tab forward or backward

Swipe up with three fingers: Read current window

Swipe down with three fingers: Start reading on explorable text

Swipe up or down with four fingers:  Turn semantic zoom on or off where supported

Swipe left or right with four fingers: Move Narrator cursor to beginning or end of unit

Source: Microsoft